Sound
Sound is a vibration that propagates as an acoustic wave, through a transmission medius such as gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
Facts about sound
1. The loudest natural sound on earth is caused by erupting valcano.
2. Dogs are capable of hearing sounds at a much higher frequency than humans can. They can hear sounds or noises humans cannot.
3. Do you know what is louder than car horn? The cry of a human baby, which is about 115 decibels.
4. Flies can’t hear any sound not even their buzzing.
5. Since particles are closer together in water than in air, sound can travel four times faster in air.
6. Sound travels at a speed of around 767 miles per hour.
7. Horror films like to use infrasound, which is below the range of human hearing. It creates shivering, anxiety, and even heart palpitations in humans when it is being played.
8. when the rockets fire, it is wise that you stand at least one kilometer away lest you get inundated by 165-170 decibels of painful sound.
9. 75 meters away from the impact, the resulting explosion from a 1 ton bomb creates a decibel count of 210.
10. At the bursting point of fire works reach a staggering 145-150 decibel levels.
Speed of sound in all medium
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